re PR fortran/91727 (ICE in conformable_arrays, at fortran/resolve.c:7490)

2019-09-15  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/91727
	* resolve.c (conformable_arrays):  If array-spec is NULL, then
	allocate-object is a scalar.  a conformability check only occurs
	for an array source-expr.

2019-09-15  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/91727
	* gfortran.dg/pr91727.f90: New test.

From-SVN: r275731

gcc/fortran/ChangeLog

+2019-09-15  Steven G. Kargl  <kargl@gcc.gnu.org>
+
+	PR fortran/91727
+	* resolve.c (conformable_arrays):  If array-spec is NULL, then
+	allocate-object is a scalar.  a conformability check only occurs
+	for an array source-expr.
+
 2019-09-15  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR fortran/91550

gcc/fortran/resolve.c

@@ -7485,7 +7485,7 @@ conformable_arrays (gfc_expr *e1, gfc_expr *e2)
   for (tail = e2->ref; tail && tail->next; tail = tail->next);
 
   /* First compare rank.  */
-  if ((tail && e1->rank != tail->u.ar.as->rank)
+  if ((tail && (!tail->u.ar.as || e1->rank != tail->u.ar.as->rank))
       || (!tail && e1->rank != e2->rank))
     {
       gfc_error ("Source-expr at %L must be scalar or have the "

gcc/testsuite/ChangeLog

+2019-09-15  Steven G. Kargl  <kargl@gcc.gnu.org>
+
+	PR fortran/91727
+	* gfortran.dg/pr91727.f90: New test.
+
 2019-09-15  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR fortran/91550

gcc/testsuite/gfortran.dg/pr91727.f90

+! { dg-do compile }
+! Code contributed by Gerhard Steinmetz.
+program p
+   type t
+      class(*), allocatable :: a
+   end type
+   type(t) :: x
+   allocate (x%a, source=[1]) ! { dg-error "have the same rank as" }
+end